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Effects of frequency, magnitude, damping and direction on the discomfort of vertical whole-body mechanical shocks

Ahn, Se-Jin and Griffin, Michael J. (2008) Effects of frequency, magnitude, damping and direction on the discomfort of vertical whole-body mechanical shocks Journal of Sound and Vibration, 311, (1-2), pp. 485-497. (doi:10.1016/j.jsv.2007.09.026).

Record type: Article

Abstract

The discomfort of seated subjects exposed to a wide range of vertical mechanical shocks has been studied experimentally. Shocks were produced from responses of single degree-of-freedom models with 16 fundamental frequencies (0.5–16 Hz) and four damping ratios (0.05, 0.1, 0.2 and 0.4) to half-sine force inputs. Shocks with a damping ratio of 0.4 were presented with both polarities. Each type of shock was presented at five unweighted vibration dose values (0.35–2.89 m s?1.75). The magnitude estimates of 15 subjects to all 400 shocks showed that the rate of growth in discomfort (the exponent in Stevens’ power law) decreased with increasing shock frequency from 0.5 to 4 Hz. Equivalent comfort contours showed greatest sensitivity from 4 to 12.5 Hz. At lower magnitudes, variations in discomfort with frequency were similar to weighting Wb in British Standard 6841. At higher magnitudes, low frequencies were judged relatively more uncomfortable than predicted by this weighting. There were small but statistically significant differences in discomfort associated with variations in damping ratios and shock direction. It is concluded that the frequency dependence of discomfort produced by vertical shocks depends on shock magnitude, but for shocks of low and moderate discomfort, the current evaluation methods are reasonable

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Published date: 18 March 2008
Organisations: Human Sciences Group

Identifiers

Local EPrints ID: 49611
URI: http://eprints.soton.ac.uk/id/eprint/49611
ISSN: 0022-460X
PURE UUID: e82141e5-8f86-480c-9ff0-842afef315e1
ORCID for Michael J. Griffin: ORCID iD orcid.org/0000-0003-0743-9502

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Date deposited: 22 Nov 2007
Last modified: 17 Jul 2017 14:55

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Author: Se-Jin Ahn

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